/*
ID: ruhansa1
TASK: gymnastics
LANG: C++
*/
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int k;
int n;
int counter=0;
int main() {
freopen("gymnastics.in", "r", stdin);
freopen("gymnastics.out", "w", stdout);
cin >> k >> n;
int pairs[n][2];
int comparing[n][2];
for(int i=0; i<k-1; i++){
for(int j=0; j<n-1; j++){
cin >> comparing[i][j];
cout << comparing[i][j]<< " ";
}
}
for(int i=0; i<k-1; i++){
for(int j=0; j<n-1; j++){
for(int l=0; l<n-1; l++){
cin >> pairs[i][j];
if(pairs[i][j]==comparing[i][j])
counter++;
}
}
}
cout << 2*counter << endl;
return 0;
}
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